I happen to own the first StarCraft and its expansion Brood Wars. I also own the Starcraft Archive.

Personally, I think that the perfect army is a joint Terran-Zerg-Protoss force, as you can have a lot more than just 200 troops, and numbers is a quality of its own. Plus, each unit as its own ability, like the Dark Archon's Mind Control, the Medic's Healing, and the Lurker's ability to attack underground. Very valuable.